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Adaptive tuning of large-signal resonant circuits using phase-switched fractional capacitance

Adaptive tuning of large-signal resonant circuits using phase-switched fractional capacitance
Adaptive tuning of large-signal resonant circuits using phase-switched fractional capacitance
Inductively coupled systems used in applications such as RFID and wireless power often require high Q factor resonant transmitters to maximize the magnetic field and achieve high overall efficiency. However, these are sensitive to environmental detuning as well as component tolerances. Existing methods for accurate tuning require search algorithms, usually requiring the suspension of normal operation in order to calibrate the resonant inductor-capacitor circuit, thus reducing power throughput and increasing system complexity. We describe here how zero-voltage switched fractional capacitance techniques may be used to achieve continuous and real-time adaptive tuning of large-signal resonant inductor-capacitor circuits. Minimal additional circuitry is required and tuning is maintained without disrupting normal operation. Many variants are possible for the implementation of the system, and some tradeoffs relating to the available tuning range and operating voltages are analyzed for two alternative topologies. Experimental results are presented for a 125-kHz demonstration system.
1072-1076
Redman-White, William
d5376167-c925-460f-8e9c-13bffda8e0bf
Kennedy, Henry
c5126d0a-7d40-4c1b-95fd-412700da946f
Bodnar, Rares
37f4be97-985b-401d-bd9a-a4d3caf007e9
Lee, Teerasak
dc9a50a6-f921-4a0d-b34e-ccea3403babc
Redman-White, William
d5376167-c925-460f-8e9c-13bffda8e0bf
Kennedy, Henry
c5126d0a-7d40-4c1b-95fd-412700da946f
Bodnar, Rares
37f4be97-985b-401d-bd9a-a4d3caf007e9
Lee, Teerasak
dc9a50a6-f921-4a0d-b34e-ccea3403babc

Redman-White, William, Kennedy, Henry, Bodnar, Rares and Lee, Teerasak (2017) Adaptive tuning of large-signal resonant circuits using phase-switched fractional capacitance. IEEE Transactions on Circuits and Systems II: Express Briefs, 64 (9), 1072-1076.

Record type: Article

Abstract

Inductively coupled systems used in applications such as RFID and wireless power often require high Q factor resonant transmitters to maximize the magnetic field and achieve high overall efficiency. However, these are sensitive to environmental detuning as well as component tolerances. Existing methods for accurate tuning require search algorithms, usually requiring the suspension of normal operation in order to calibrate the resonant inductor-capacitor circuit, thus reducing power throughput and increasing system complexity. We describe here how zero-voltage switched fractional capacitance techniques may be used to achieve continuous and real-time adaptive tuning of large-signal resonant inductor-capacitor circuits. Minimal additional circuitry is required and tuning is maintained without disrupting normal operation. Many variants are possible for the implementation of the system, and some tradeoffs relating to the available tuning range and operating voltages are analyzed for two alternative topologies. Experimental results are presented for a 125-kHz demonstration system.

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Adaptive Tuning of Large-Signal Resonant Circuits - Accepted Manuscript
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Accepted/In Press date: 21 October 2016
e-pub ahead of print date: 15 November 2017
Additional Information: This is on journal template. Author confirmed this is AM.

Identifiers

Local EPrints ID: 415625
URI: https://eprints.soton.ac.uk/id/eprint/415625
PURE UUID: 4b588fba-dc7f-4e62-b139-0bd633973dc8

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Date deposited: 16 Nov 2017 17:30
Last modified: 11 Nov 2019 18:35

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